Is that a brick wall limiter? If so, it's "compressing" (turning down the louder frequencies) by putting a hard limit on the output. Some brick wall limiters will have a separate "brick wall gain" that is basically make up gain that's a required limit instead of addaditive to bring the volume back up if you pushed the first stage limiter down below where you want the output at that stage.
I already have the bx_masterdesk TruePeak. It's just crazy to me that you can be that loud but their is no distortion in the headphones, it's voodoo magic lol. I know this tech goes back to Red Hot Chili Peppers but I want to relish in the moment of turning it up to 11.
@Humpleupagus@charlie_root It's a combination of saturation, mid/side manipulation, and a limiter. I't likely got a variable EQ to shape around the limiter and probably a clipper as well. At least that's what it's designed to take the place of. It's just aimed at making mastering loud easy without distortion being too noticeable. If you can clip each track and saturate, eq and limit on the master yourself, you don't need it. I tested it out and it's was pretty good on the tracks I tried.